Austin is attracting many people from out of state and we are losing our regionalism. It is nice to have a booming job market but I miss the days of my youth when people understood and were not amused by:

y'all
coke (all sodas are cokes, if a native Texan says they want a coke you ask what kind.)
fixin'
darlin', sugar, sweetheart and baby- these are polite if an elder that is a stranger calls you this.
BBQ- like the post above this means slow cooked meat, often brisket. Hamburgers and hotdogs are reserved for grillin' or a cook-out.

These are the only ones I can think of but I know there are more. We have lost the regional naming of streets. People move here and call them by their proper name whereas we call them the old name or a nickname.